Blade grinding machine



May 5, 1942. H, H|| 2 2,281,975

` BLADE GRINDING MACHINE Filed June 3, 1941 INVENTOR I ATTORNEY May 5, 1942.

H. HILL l 2,281,975 BLADE GRINDING MACHINE Filed June 3, 1941 Y 3 Sheets-Sheet 2 INVENTOR ATTORNEY May 5, 1942. H. HILL. -2,281,975

BLADF` GRINDING MACHINE Filed June 5, 1941 3 Sheets-'Sheet 3 1x El E l will? INVENTOR Hm/y/A/v/ v /`//LL Patented May 5, 1942 BLADE GRINDING MACHINE Hermann Hill, Bridgeport, Conn., assigner to Magazine Repeating Razor Company, New York, N. Y., a corporation of New Jersey Application June 3, 1941, Serial No. 396,381

15 Claims.

The object of the invention is a machine for grinding a cutting edge on a margin of a continuously traveling strip of blade making material.

More specifically, the Objectis to provide for secure and definite alignment of the strip as it travels with respect to the grinding tools for altering the grinding angle at will.

Further objects will appear in the course of the explanation of the invention.

Briefly describing the drawings,

Fig. 1 is a diagrammatic plan View showing a machine in which the invention may be incorporated;

Fig. 2 is a plan view of a grinding unit;

Fig. 3 is a view on the line 3-3 of Fig. 2:

Fig. 4 is a view on the line 4-4 of Fig. 3;

Fig. 5 is a View on the line 5-5 of Fig. 4;

Fig. 6 is a plan View of part of a grinding unit with parts broken away to show details;

Figs. '7, 7a, 7b, and 1c are series of views showing the changing section of a blade strip as it passes through successive guide rolls and also showing the contours of the rolls; g

Fig. 8 is an enlarged view partly in section of a blade guide;

Fig. 9 is an isometric view of a thrust block.

Fig. 10 is a fragmentary view showing the variation in the angle of the face of the thrust block for causing a change in the grinding angle.

In describing the machine and its component units, the side of the machine that is uppermost on the sheet in Fig. 1 will at times be referred to as the right or right-hand side of the machine and that side which is lowest on the sheet will at times be referred to as the left or left-hand side of the machine.

The units that make up the machine are two grinding units A and A', three honing units B, B', and B2, five wiping units C, C', C2, C3, and C4, a strip feeding unit D, a breaking unit E, and a stacking unit F. The number of grinding units and the number of honing units may, of course, be increased or under some circumstances reduced, but it has been found that the number of each as given is suicient to bring a strip to a Sharp cutting edge, and therefore it is adopted for -commercial work.

The stock or blade strip M which is to be ground and honed as it passes through the machine is drawn from a conventional reel (not shown) located in advance of the rst grinding unit. In dimensions it would vary in width from say .300l to perhaps 1" and in thickness perhaps from .003 to .012, and its margins are provided with pairs of opposite notches 9, 9, each successive pair being spaced a blade length from the preceding pair. The purpose in providing the notches is for cao-operation with the breaking mechanism of unit A will be described in full, the

differences between succeeding wheels and associated mechanisms being pointed out hereafter.

The working parts are supported on a table III mounted on a conventional frame I I. The grinding tools comprising the rotatingly mounted wheels I2 and I3 of bonded abrasive material are mounted respectively on hangers I4 and I5 by means of stub shafts I8 and I'I. The hangers are suspended from non-rotatably mounted shafts I8 and I9 upon which they may swing independently of each other transversely of the longitudinal centerline of the machine. They may, if desired, be located in selected angular position by means of the split clamp collars I8a and ISa, but preferably these collars are drawn up only tight enough so that they clamp the shafts without play but are nevertheless rotatable without disturbing them. They are prevented from sliding along the shafts by split collars |31) and I9b surrounding the shafts. rli'he grinding wheels are therefore capable of movement independently of each other toward and away from the blade strip M. To adjust them accurately to grinding position and to maintain them in position after adjustment, I provide the links 20 and`2I with actuating mechanism. The link 2| is pivotally connected to the hanger i5 as shown at 22 and to the block 23 as indicated at 24. The block 23 is slidably mounted in the track member 25 and is retained in sliding contact by the gibs 20a and 2Ia and has a threaded bore to receive the nontraversing screw 26 at the end of the shank 27. The shank 21 passes through the bearing 23 and is xedly secured to a bracket 23a against longitudinal movement by the collars 29 and 30 xedly mounted on it. Assuming that the screw 2G has a right-hand thread, rotation to the right of the hand wheel 3I liixedly mounted on the shank draws the grinding wheel I3 (when the collar lila is loosened) toward the blade strip, and rotation to the left moves it away from the blade strip.

The grinding wheel I2 is adjusted in the same way by turning the hand wheel 33 which operates through a mechanism exactly similar to the adjusting mechanism for the grinding wheel I3 except that the screw 32 preferably is provided with a left-hand thread in order that the direction of rotation of the hand wheels 3l and 33 may be the same for bringing the grinding wheels toward the blade strip and also the same for moving them away from the blade strip.

On the stub shafts are mounted the pulleys 34 and 35 which are driven by the belts 36 and 3l vided for each grinding wheel of a grinding unit.

It will be assumed that the one actually described is used in conjunction with abrasive wheel I-i. e the first abrasive wheel in the vstrip and the grinding wheel, washes loose series, although as will become apparent, thatused in conjunction with abrasive wheel I2 is similar except as to certain changes that will'be pointed out and except that it is reversed in position from right to left. As the blade strip M travels through the machine in the direction of thearrow (Fig. 4), any given section thereof rst meets and passes under the idler roller 50 mounted in a bearing I and provided with a peripheral groove 52 just wide enough to accommodate the strip comfortably but without play. The strip then passes over a series of three successive rollers 53, 54, 55, all of which are alike and are illustrated in Fig. 8. Their peripheries are all in line with each other. The strip travels on the periphery of the rollers and', after leaving the roller 55, passes beneath the roller 55, which is similar to the roller 5I) and, as shown in Fig. '7, is provided with a peripheral groove which acts as a guide to the strip. Each of the rollers 53, 54, and 55 is provided with a radial'fiange 51 and is mounted on a shaft 58 revolving in the bearing 59. The thrust block 6i! in c'o-operation with the roller 5.5 takes the thrust of the grinding wheel as shown diagrammatically in Fig. 8, the strip traveling flatwise along and against it. The thrust block, as shown in Fig. 5, is adjustable toward and away from and across the plane of the flange 51, this adjustment being accomplished by the operating set screws 5I and 62 threaded in the block 53 and bearing against the thrust block itself. As these screws are turned, they eitherforce the thrust block in the direction of the plane or allow clear ance whereby itmay be withdrawn by operating the screw 64, The screw 64 is always used whatever be the direction of the adjustment, to set the thrust block firmly against the screws 5I and 62.

'Ille thrust block itself shown in Fig. 9 may be provided with slots 65 to serve as water passages, and they are shaped in such a way as to direct the water stream where wanted and to reduce the liability to clogging by the lodgm'ent of small masses of abrasive and the lilre.l In order that these results may take place, the slots are vnarrower at the top as shown than they are at the bottom, and the rear wall 66 slopes toward the blade strip.

The shaft 58 on which the roller 54 is mounted is provided with a collar 6l and a set screw G8 therefor. The collar is slidable on the shaft, and therefore by utilizing the set screw the roller 54 can be set by movement axially so that it rotates in different planes. A resilient washer 59 is interposed on the shaft 53 between the roller 513 and the bearing 55; which permits the slight range of axial movement which is necessary for this ad justment. Whenever an adjustment of this character is made, the face of the thrust block is suitably shaped to accommodate the changed angle as is illustrated in Fig. 10, to be referred to.

The grinding wheel turns in the direction of the arrow (Fig. 8) and accordingly is constantly pressing the strip on the lower guide rollers, the

abrasive down through the channel 1I and out through the orifices 12. Some of the stream is directed through the slots 55 as has been before mentioned.

Each grinding unit is provided with two grinding wheels, the first in order as the strip travels) grinding one facet and the second grinding the opposite facet. Fig. 7 shows the upper guide roller 55 with the strip in association therewith and showing its section after it has passed the first wheel of grinding unit A-i. e., the wheel I3. The second wheel of grinding unit A (wheel I2) and its associated mechanism is identical with the first wheel and its mechanism except that, as shown in Fig. 2 the parts are reversed in position in the unit and also with the exception that the upper guide roller corresponding to the upper guide roller 5s is provided with a peripheral groove shaped as shown in Fig. 7a; that is to say, it has convergent walls 8i between which the the facets rest, the now ground edge being free from contact with the bottom of the groove. All upper guide rollers of the grinding unit A are similar to the modification of guide roller 5- i. e., their peripheral grooves are shaped to prevent contact of the blade edge with the bottoms illustrated in Figs. 7b and 7c. The groove in guide roller 50 yof grinding unit A is shaped as shown in Fig. 7.

It is contemplated that the rst grinding unit shall produce a fully ground edge, the second grinding unit still further grinding this edge down. In other words, the first grinding unit brings the strip to a sharp ground edge and the second grinding unit takes still more stock from the facets, thus reducing the width of the strip. The'abrasive of the second unit is a grade or more finer than that of the first grinding unit, and-so, therefore, a more perfectly finished edge is produced in grinding unit A.

`In Fig. 10- is shown a thrust block modified from that of Fig. 8 by undercutting its face so ,v that the angle of grinding is increased-that is to say, the angle subtended by the facets is greater. The pulley 54 has been adjusted so that the blade strip still travels flatwise against the face of the thrust block.

In Figs. 1, 5, and 6, there-isV shown a mechanism for driving the hanged rolls which support the blade so that the peripheral speed of the peripheries of the rolls is timed with the speed of the feed' mechanism D. In other words, the peripheral speed of the feed' rolls 8i) and SI is the same as that of the rolls 53, 54, and 55. The object is to reduce the friction on the peripheries of the guiding rolls which takes place to a considerable degree if they are merely allowed to idle. The mechanism for each guide roll comprises a spiral gear 82 Xed on the end of the shaft 58 and meshing with thespiral gear 83 iixed on the vertical shaft 84. On. the lower end of the vertical shaft 84 is another spiral gear 85 meshing with a spiral gear 8B fixed on the lay shaft 8l. The vertical shaft rotates in the step bearing 88 and in a bearing 89 in the bracket 90. The mechanism for each guide roller of both grinding units is identical', all being driven from a gear similar to the gearll on the lay shaft 81. The

lay shaft 81 is provided with a spiral gear 9i! xedly mounted on it,` which meshes with a spiral gear 9| on the shaft of the feed roller 8l, and the ratios of the train of gearing from the shaft 92 through to each of the guide roll shafts are properly fixed so that the peripheral speed of the feed rolls is the same as the peripheral speed of the guide rolls.

The feed rolls are geared together, the roll 8| being driven by the belt 94 through the pulley 95 on the shaft 92 and rotating therewith. On the same shaft is a spur gear 96 axed thereto, which meshes with a spur gear 91, which rotates with the roll 80.

While I have described a certain particular construction in which my invention is incorporated, I do not desire to be limited to this particular embodiment since many changes and modifications may easily be made without departing from the spirit and scope of the invention as set forth in the following claims.

I claim: 1. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding Wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in atwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided with radial flanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground.

2. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding Wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in atwise contact therewith, the edge to be ground extending beyond the said face of the thrust block, the peripheries of the rolls being provided with radial iianges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the rolls being adjustable axially causing the grinding angle to be changed.

3. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in fiatwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided With radial flanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the grinding wheel being mounted on a member mounted to swing transversely of the blade strip.

4. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding Wheel, said means comprising a series of rolls on the peripheries of which the other margin of the wstrip travels, a thrust block along and against one face of which the strip travels in atwise contact therewith, the edge to be ground extending beyond the said' face of the thrust block, the peripheries of the rolls being provided with radial flanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground,y the rolls being adjustable axially causing the grinding angle to be changed, the grinding wheel being mounted on a member mounted to swing transversely of the blade strip.

5. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding Wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in atwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided with radial anges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the thrust block being adjustable toward and away from the path oi travel of the strip.

6. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding Wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatwise Contact therewith, the edge to be ground extending beyond the said face of the thrust block, the peripheries of the rolls being provided with radial anges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the rolls being adjustable axially causing the grinding angle to be changed, the thrust block being adjustable toward and away from the path of travel of the strip.

7. In. a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding Wheel, means for guiding and supporting Ithe strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries oi which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided with radial flanges against which the strip bears in response to pressure exerted by the grinding Wheel against the margin being ground, the said face of the thrust block being undercut.

8. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in iiatwise contact therewith, the edge to be ground extending beyond the said face of the thrust block, the peripheries of the rolls being provided with radial iianges against which the strip bears in response to pressure exerted by the grinding Wheel against the margin being ground, the rolls being adjustable axially causing the grinding angle to be changed, the said face of the thrust; block being undercut.

9. In a machine for grinding one margin of a strip oi blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a. series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided with radial iianges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the grinding wheel being suspended by swinging hangers, and means for adjusting the wheel toward and away from the path of the strip. i

l0. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding Wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolis on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided with radial flanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, mechanism for propelling the strip, and mechanism adapted to rotate the rolls at a the speed of travel of the strip.

1l. In a machine for grinding one margin of a strip `of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatwise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the yrolls .being provided with radial flanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, mechanism for propelling the strip, and mechanism adapted to rotate the rolls at a peripheral speed equal to the speed of travel of the strip, said mechanism comprising a gear train operatively connecting the propelling means with the rolls.

l2. In a machine for grinding one margin of a strip of blade stock to a cutting edge', a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatwise Contact therewith, the edge to be ground extending beyond the said face of the thrust block, the peripheries of the rolls being provided with radial ilanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the rolls being adjustable axially causing the grinding angle to be changed, means for propelling the blade strip, and mechanism adapted to cause the rolls to peripheral speed equal to rotate at a peripheral speed equal to the speed of travel of the blade strip.

13. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in flatv/ise contact therewith, the edge to be ground extending beyond the other face of the thrust block, the peripheries of the rolls being provided with radial anges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the grinding wheel being mounted on a member mounted to swing transversely of the blade strip, feed rolls for compelling the strip, rotatable shafts on which the rolls are mounted, gears on the shafts and a gear train operatively connecting the feed rolls with the first-mentioned rolls at a peripheral speed equal tc the peripheral speed of the feed rolls.

14. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding Wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in atwise contact therewith, the edge to be ground extending beyond the said face of the thrust block, the peripheries of the rolls being provided with radial anges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the rolls being adjustable axially causing the grinding angle to be changed, the grinding Wheel being mounted on a member mounted to swing transversely of the blade strip, feed rolls for compelling the strip, rotatable shafts on which the rolls are mounted, gears on the shafts and a gear train operatively connecting the feed rolls with the first-mentioned rolls at a peripheral speed equal to the peripheral speed of the feed rolls.

l5. In a machine for grinding one margin of a strip of blade stock to a cutting edge, a grinding wheel, means for guiding and supporting the strip and opposing the pressure of the grinding wheel, said means comprising a series of rolls on the peripheries of which the other margin of the strip travels, a thrust block along and against one face of which the strip travels in fiatwise contact therewith, the edge to be ground extending beyond the said face of the thrust block, the peripheries of the rolls being provided with radial flanges against which the strip bears in response to pressure exerted by the grinding wheel against the margin being ground, the rolls being adjustable axially causing the grinding angle to be changed, the thrust block being adjustable toward and away from the path of travel of the strip, feed rolls for compelling the strip, rotatable shafts on which the rolls are mounted, gears on the shafts and a gear train operatively connecting the feed rolls with the rst-mentioned rolls at a peripheral speed equal to the peripheral speed of the feed rolls.

HERMANN HILL. 

